The purpose of this experiment is to determine the effects of adding different levels of NH4NO3 at different times during the growing season. This experiment is being conducted inside the fenced areas of ... fields A and B. See CDR001 for description of fence construction. There are seven treatments: six combinations of three fertilization dates and two nitrogen levels, and one control. There are five replicates of each treatment for 35 plots in each field. The nitrogen levels are E, G, and I and are defined in NUTRADD.DOC in the "microplot" strategy. The times of fertilization are roughly May, June, or July. The plots are laid out in a 5 x 7 grid and are 1.5 m x 3.5 m in area. Aisles are 1 m wide in field A and 0.75 m wide in field B.

Proprietary limits: Investigators have priority over data for five years, but are interested in collaboration for novel comparisons before then.

The Cedar Creek Natural History Area (CCNHA) is a 2200 hectare experimental ecological reserve operated by the University of Minnesota in cooperation with the Minnesota Academy of Sciences. CCNHA is located in Anoka and Isanti Counties north of Minneapolis/St. Paul. The site was established in 1940, was designated a National Natural Landmark by the National Park Service in 1975. In 1977 it was included as an Experimental Ecology Reserve in a proposed network, and in 1982 it was one of 11 sites in the U.S. selected by the National Science Foundation for funding of LTER.